Bishop-General Macarius, a Coptic Orthodox leader, walks around the burnt and damaged Evangelical Church in Egypt’s Minya governorate, about 245 km (152 miles) south of Cairo, August 26, 2013. REUTERS/Louafi Larbi

Reported cases of Christians killed for their faith around the world doubled in 2013 from the year before, with Syria accounting for more than the whole global total in 2012, according to an annual survey.

Open Doors, a non-denominational group supporting persecuted Christians worldwide, said on Wednesday it had documented 2,123 “martyr” killings, compared with 1,201 in 2012. There were 1,213 such deaths in Syria alone last year, it said.

“This is a very minimal count based on what has been reported in the media and we can confirm,” said Frans Veerman, head of research for Open Doors. Estimates by other Christian groups put the annual figure as high as 8,000.

The Open Doors report placed North Korea at the top of its list of 50 most dangerous countries for Christians, a position it has held since the annual survey began 12 years ago. Somalia, Syria, Iraq and Afghanistan were the next four in line.

The United States-based group reported increasing violence against Christians in Africa and said radical Muslims were the main source of persecution in 36 countries on its list.

“Islamist extremism is the worst persecutor of the worldwide church,” it said.